- Obstetricians, Ames - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Ames - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Ames - Occupational Medicine
- Occupational Health Care Professionals, Ames
- Occupational Medicine Doctors, Ames - Physicians & Surgeons
- Occupational Rehabilitation, Ames
- Office Supplies, Equipment & Office Furniture Stores, Ames
- Oil & Gas Companies, Ames
- Oil Change & Lubrication, Ames - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Ames
- Oil Industry & Oil Field Equipment & Services, Ames - Oil Companies
- Oil Refinery, Ames
- Oncologists, Ames - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Ames - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ames
- Opticians, Ames
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- Optometrists, Ames - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ames - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Ames
- Ornamental Nursery, Ames
- Ornamental Nursery Products, Ames
- Ornamental Nursery Services, Ames
- Orthodontist, Ames - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Ames - Orthopedic Shoes
- Orthotics and Prosthetics, Ames
- Osteoporosis Doctors, Ames - Physicians & Surgeons
- Other Building Materials & Supplies, Ames
- Other Lodging, Ames
- Outdoor Equipment & Accessories, Ames
- Outdoor Furniture, Ames
- Outdoor Furniture & Patio Furniture, Ames - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Ames - Oxygen Concentrator, Tank, Machine, etc
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